uinavigationcontroller - iOS WatchKit - How to detect when back button is pressed on Watch? -

i need cleanup on 2nd view controller when button (arrow) pressed on apple watch. there sort of method detecting/handling when button pressed / view popped?

note - can't use 'willdeactivate()' function gets me stuck in loop trying do.

there no method detect button touched. correct/only place in diddeactivate, though sounds won't work you.